Scientists are convinced______ the positive effect of laughter______ physical and mental health.
|
A．of ; at |
B．by ; in |
C．of ; on |
D．on ; at |
Exactly when the first people arrived in ________ we now know as California, no one really knows.
|
A．which |
B．what |
C．that |
D．it |
The patent officer ______ with my file explained to me that a plant variety is not a/an _______ invention as it is a result of adjusting growth scientifically.
|
A．dealing; abrupt |
B．dealt; innocent |
|
C．deals; practical |
D．dealing; valid |
The scientist __________ the experiment for half a year, but he _______ yet.
|
A．made; didn’t succeed |
B．made; hasn’t succeeded |
|
C．was making; didn’t succeed |
D．has been making; hasn’t succeeded |
Seeing the picture, I couldn’t resist ______the days_____ we spent together.
|
A．to think of; when |
B．thinking of; which |
|
C．to think of; which |
D．thinking of; when |
— “ The music is too loud. Could you please turn down the radio a bit?”
— __________________
|
A．Sorry. I didn’t know you were reading. |
|
B．Thank you. It’s very kind of you. |
|
C．Don’t trouble. I like music. |
|
D．Oh, it’s an honor for me to do so. |
